【Q&A Question 145】2018.05.25

The cooling water is not treated; ions such as calcium and magnesium in the water tend to form scale at high temperatures. Additionally, if the cooling fluid is not clean and flows slowly, dirt can easily accumulate inside

Yes: ① Poor quality of cooling water, containing impurities such as sediment； ②The water contains a small amount of soluble carbonates, which decompose and precipitate on the inner walls of the equipment when heated, forming what is known as \"scale\"” ； ③The flow rate of the cooling water in the cooler is too low, allowing impurities to easily accumulate on the walls of the cooler tubes.

1. High ammonia nitrogen and high turbidity in the circulating water, as well as scaling caused by poor water quality； 2. High medium temperature and low circulation water volume ； 3. The supply temperature of the circulating water is high, resulting in poor cooling effects and scale formation! 4. The supply pressure of the circulating water is low, resulting in poor circulation ；

Cooler scaling generally falls into two categories: internal scaling and external scaling. Since soft water is usually used for circulation, internal scaling does not occur under normal circumstances, unless the circulating water is not soft; in such cases, it is necessary to use a descaling agent to remove the scale before switching to soft water for circulation. In most coolers, scaling occurs on the outside of the tubes. There are two reasons for this: first, the temperature of the water circulating inside the tubes is too high; since the water used for spraying is usually groundwater, which is hard water, an elevated temperature inside the tubes leads to an increase in the temperature of the spraying water, resulting in scaling on the tube walls. Second, the spraying water contains high levels of elements such as Mg; especially in mountainous areas where the water quality is hard, scaling is likely to occur. There are no perfect solutions to these problems, but it is possible to clean the coolers regularly using weak acids (depending on the material of the cooler) or descaling agents. Alternatively, if feasible, the circulating water can be passed through a tank with a large capacity before entering the cooler, which can help reduce scaling to some extent.

1. Solidified fouling: Fouling that forms when a viscous fluid solidifies on a subcooled heat transfer surface. For example, when water freezes below its freezing point on a heat transfer surface. The uniformity of the temperature distribution has a significant impact on this type of fouling.

2. Corrosive fouling: Fouling that results from the corrosion of a heat transfer surface by corrosive fluids or impurities present in those fluids. Generally, the degree of corrosion depends on the components in the fluid, the temperature, and the pH value of the fluid being processed.

3. Crystalline fouling: Deposits that form when inorganic salts dissolved in a fluid crystallize on a heat transfer surface, usually under conditions of supersaturation or cooling. Typical examples include calcium carbonate, calcium sulfate, and silica deposits on the cooling water side.

4. Biological fouling: Apart from seawater cooling systems, biological fouling generally refers to fouling caused by microorganisms. These microorganisms can produce sludge, which in turn provides conditions for their further growth. This type of fouling is very sensitive to temperature; under suitable conditions, it can result in a considerable thickness of fouling layer.

5. Chemical reaction fouling: Fouling that arises from chemical reactions occurring on the heat transfer surface. The material of the heat transfer surface does not participate in these reactions, but it can act as a catalyst for them.

6. Particle fouling: Accumulation of solid particles suspended in a fluid on the heat transfer surface. This type of fouling also includes layers of larger solid particles that settle on horizontal heat transfer surfaces due to gravity, i.e., so-called sedimentary fouling, as well as the deposition of other colloidal particles.

The reasons are: ① Poor quality of the cooling water, containing impurities such as sediment； ②The water contains a small amount of soluble carbonates, which decompose and precipitate on the inner walls of the equipment when heated, forming what is known as \"scale\"” ； ③The flow rate of the cooling water in the cooler is too low, allowing impurities to accumulate on the walls of the cooler tubes

The quality of the cooling water is poor, containing impurities such as sediment； The water contains a small amount of soluble carbonates, which decompose and precipitate on the inner walls of the equipment when heated, forming scale ； ③The flow rate of the cooling water in the cooler is too low, allowing impurities to accumulate on the walls of the cooler tubes

1. High ammonia nitrogen and high turbidity in the circulating water, as well as scaling caused by poor water quality； 2. High medium temperature and low circulation water volume ； 3. The supply temperature of the circulating water is high, resulting in poor cooling effects and scale formation! 4. The supply pressure of the circulating water is low, resulting in poor circulation ；

①The quality of the cooling water is poor, containing impurities such as sediment； ②The water contains a small amount of soluble carbonates, which decompose and precipitate on the inner walls of the equipment when heated, forming what is known as \"scale\"” ； ③The flow rate of the cooling water in the cooler is too low, allowing impurities to easily accumulate on the walls of the cooler tubes.

The cooling water is not treated; ions such as calcium and magnesium in the water tend to form scale at high temperatures. Additionally, if the cooling fluid is not clean and flows slowly, dirt can easily accumulate inside